尖副繐唇魮

<em>Paracrossochilus acerus</em> is a small freshwater fish classified within the family Cyprinidae, the carps and minnows, a family representing the greatest diversity of freshwater fishes globally. This species typically attains a maximum length of approximately 9.5 cm. Cyprinidae spans an enormous ecological range, from torrential mountain streams to slow lowland rivers and still lakes, and its members occupy virtually all trophic levels available to small and medium-sized freshwater fishes. <em>Paracrossochilus acerus</em> is native to freshwater river systems in Southeast Asia, where it likely inhabits clear, flowing streams and rivers with rocky or gravelly substrates. The genus <em>Paracrossochilus</em> is part of a complex of small cyprinids found in the Malay Peninsula and Borneo that have adapted to fast-flowing hill stream environments, and its members often display laterally compressed bodies and enhanced fin musculature suited to swimming against current. Like most small cyprinids of this region, <em>Paracrossochilus acerus</em> is omnivorous, feeding on algae, detritus, and small invertebrates grazed from or drifting over the substrate. The streams inhabited by such hill stream cyprinids in Southeast Asia are frequently under pressure from land-use change, logging, and water extraction, making accurate assessments of distribution and abundance important for conservation planning. Details of broader habitat and range for this species remain limited in the ichthyological literature.